| 摘要 |
A vibration type actuator device having a wave speed control range, wherein the driving voltage of a driving signal of the actuator device is controlled in accordance with the difference between a target speed and an actual speed, so that it increases if the actual speed is lower than the target speed, or decreases if the actual speed is higher than the target speed. The frequency of the driving signal also is controlled to decrease if the driving voltage is higher than a predetermined value, or to increase if the driving voltage is lower than the predetermined value.
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